Is it possible for force to act on a object with out work being done?

Answer 1

No. The centripetal force will change the velocity of the object, but it won't make it go any faster - so it won't transfer energy to the object. Another way to look at this is that the centripetal force is at right angles to the movement. Since the cosine of the angle is zero, the vector dot product (force x distance x (cosine of angle between the two)) is also zero.

Answer 2

No, work is only done when the object being forced moves in the same direction as the force. For example, when you push a box across a room, you are doing work, since the box is moving in the direction you are pushing it. Although if you were pushing against a wall you would not be doing any work, since the wall wouldn't move in the direction you pushed it.

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So if the point of application of the force gets displaced then work is said to be done by the force. It is measured by the product of the force and the displacement in the direction of the force. If the displacement is inclined with the direction of the force then the resolved component in the direction of the force is taken into account. If suppose the displacement is perpendicular to the direction of force then no work is said to be done. This is the case of carrying a load by the porter on his head and he walks on a horizontal path way.

Answer 3

No - work is a "path function"; that is to say, it is a property of a process, not a property of an object or system. Work can be done ON a system or BY a system, but a system (or object, it that's how you want to define your system) does not possess work as a property like density, color, temperature, etc.

Answer 4

Yes. The formal definition of work is: Force acting through a distance, or W=FD. If the object in question doesn't move, then D=0, and then W=0 no matter what 'F' is.

Example: Push on the wall, or on a car in "Park". Sure you'll get tired of it, and your muscles may complain after a while. But according to the strict scientific definition, no work is done, because the force traverses no distance.

Answer 5

Yes, it is possible for a force to act on an object without work being done if the object does not move in the direction of the force. Work is calculated as the product of force and displacement in the direction of the force, so if there is no displacement, then no work is done.

Answer 6

Yes. The normal force can do work on an object as long as it is not perpendicular to the displacement of said object.

Answer 7

If the force is unbalanced, it causes acceleration. This involves doing work to move it in a certain direction.

Answer 8

Yes the normal force can be greater than the weight. When accelerating upwards in an elevator, the normal force is greater than one's weight.

Answer 9

It does if the object moves. The work done is (force) times (distance moved).

Pushing on a brick wall does no work.

Pushing a book does work.